Reactivity improvement of urethane prepolymers of allophanate-mo

Details Reactivity improvement of urethane prepolymers of allophanate-mo Reactivity improvement of urethane prepolymers of allophanate-mo

1997-11-04

1998-07-21

Gorr, Rachel

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From reactant having at least one -n=c=x group as well as...

25218222, 528 59, 528 73, 528 745, 524774, C08G 1810

Patent

active

057836523

ABSTRACT:
This invention relates to mixtures of urethane prepolymers of allophanate-modified diphenylmethane diisocyanates with epoxides. The addition of the epoxide increases the reactivity of these prepolymers. It is now possible to form polyurethanes from these mixtures based on prepolymers of diphenylmethane diisocyanates wherein less catalyst is necessary.

REFERENCES:
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patent: 3925437 (1975-12-01), Rowton
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patent: 4118286 (1978-10-01), Burns et al.
patent: 4310688 (1982-01-01), Mendoza
patent: 4661627 (1987-04-01), Regelman
patent: 4738991 (1988-04-01), Narayan

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